<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
  <form action="add" method="get">
      用户名:<input type="text" name="userName"><br>
      密码:<input type="text" name="password"><br>
      生日:<input type="text" name="birthday"><br>
      <input type="submit" value="添加">
  </form>
</body>
</html>